Heating element



C. C. ARMSTRONG.

HEATING ELEMENT.

APPLICATION FILED JUNE 24, I922.

1,438,424, Patented Dec. 12, 1922.

2 SHEETS SHEET l.

Cizazzles C. Armsimny,

C. C. ARMSTRONG HEATING ELEMENT.

APPLICATION FILED JUNE 24,1922.

1,438,424, Patented Dec. 12, 1922.

2 SHEETS SHEEI 2.

i F 14 r Charles C. Arm .sjfmn y,

Patented Dec. 12, 1922.

UNITED STATES PATENT OFFICE.

CHARLES C. ARMSTRONG, OF MABYS VILLE, OHIO.

HEATING ELEMENT.

Application filed June 24, 1922. Serial No. 570,597.

To all whom it may concern:

Be it known that I, CHARLES C. ARM- STRONG, a citizen of the United States, and a resident of Marysville, in the county of Union, in the State of Ohio, have invented certain new and useful Improvements in Heating Elements, of which the following is a specification.

My present invention relates to electric cooking or,heating devices and more particularly to the arrangement of resistance elements therein.

The primary object of my invention is to devise a disposition of the heating element that will produce a maximum exposure thereof for heating or cooking, the minimum amount being ineffective.

Another object of my invention is the arrangement of the various instrumentalities whereby the above results are accomplished, although obviously, various rearrangeinents, combination and construction of parts may be practiced within the scope of the invention.

I have shown a preferred embodiment of my invention in the drawings wherein a heating section of a cooking stove is illustrated, and the heating element is in two planes. Any insulation means may be provided between the planes of heating elements, such as soapstone, or the like.

This application illustrates an improved arrangement of resistance element, over the usual device of the type in which the heating element is wound about the insulating ends, that portion of said element on the outside of the ends being necessarily ineffective. If the two planes of heating elements are spaced apart any distance this involves a material waste, which may be avoided in the following manner.

- Parallel slots are cut into the faces of the insulating members thus forming upstanding projections. The resistance element is disposed from the current fixture back and forth between end members, passing around projections, finally returning to the fixture by way of a longitudinal slot atthe rear of an end member. Thus each plane of heating element is independent of the other. Such a construction is obviously beneficial as either may be renewed without disturbing the other. The arrangement of the element around projections in place of passing completely around the end members, effects a material saving in length of the resistance element without reducing the effectual heating area.

In the drawings 2-- Figure 1 is a plan view, partly broken away, of a heating section of an electric stove embodying my invention.

Fig. 2 is a front elevation of the same.

Fig. 3 is a transverse section on line 33 of Fig. 1.

Fig. 4 is a detail outside face view of one of the insulators. 1

Fig. 5 is a diagrammatic perspective view of the wiring of the heating elements of Fig. 1 showing one element in full lines and the other in dotted lines.

Fig. 6 is a transverse sectional view of a stove illustrating a slightly modified method of wiring, an

Fig. 7 is a diagram, similar to Fig. 5, of the modified wiring. 7

Referring now more particularly to the embodiment illustrated, I have shown the section of an electric stove carrying the heat-' mg element consisting of a frame part i having an elongated opening 1 in one side thereof adapted to receive a cooking vessel such as an open rack for toast or the like. Secured as by screws 2 to the frame 1, I provide insulating elements 3 of soapstone, asbestos, or the like extending the full depth of the frame and having a lognitudinal slot 4 therein, the bottom of which is substantially in line with the side of the opening 1* and upon which the cooking vessel may rest. The top and bottom of the members 3 are provided with lateral slots 5 forming upstanding projections 6 therebetween. An overhanging portion 7 on these projections extends outwardly into the slots 5 to prevent the heating element from becoming accident-ally displaced. A heating element 8 connected to a suitable source of energy through the fixture 9 having terminals 10 and 11, is arranged in a zig-zag manner between projections 6 on opposite elements 3 to form the heating element in one plane then passing behind one of the members 3 into longitudinal slot 12 and back to the other terminal of the fixture 9. Thus the heating element in each plane is continuous, but independent of the other.

The heating element may be circular, square, fiat or convolute as desired.

With this construction bread, for example, may be toasted between the two elements on both sides simultaneously. It may be found desirable to place an open grille work 13 having projections 1% disposed between members 3 and the casing 1 so as to be gripped therebctwcen by the screws 2 when tightened. in proximity to each plane of heating element having elongated apertures 1!) coinciding with the individual strands of the element to facilitate cooking in additional vessels above and below the heating elements.

It may be found desirable to form the resistance elements of each plane into one piece. In this form it would be necessary to provide a slot 17 at the rear of one end member 3 to receive the strand of heating element after zig-zagging between projections on one side of the end members. This slot allows the element to pass to the other plane. and then to the fixture completing the circuit.

In either form the ultimate length of the heating element is materially shortened due to the fact that a small portion thereof, only, passes behind the end members. This arrangement is therefore most eflicient as the maximum amount of heating elementis ef-- fective for heating or cooking.

What is claimed is 2- 1. An electric heating element holder including spaced apart separating members, heating element strands extending from top to top, and bottom to bottom of each separa-ting member, said elements lying in two spaced apart substantial planes thereby forming three heating spaces, namely above, between and below said planes, each strand being a direct continuation of its neighbor in its plane.

2. The device of claim 1, said strands passing around projections upon the top and bottom of said separating members. 1

3. An electric heating element holder including a frame, two spaced apart separating members carried bv the frame, a heating element having one end conductively secured to a fixture adapted to receive an electric current, said heating element extending circuito'usly back and forth between separating members in substantially the same plane, and then extending likewise in a lower and different plane, the other end of the heating elementv being also attached to said fixture but insulated from said first end.

4. An electric heating element holder including a frame, two spaced apart separating members carried by the .frame, a heating element having one end conductively secured to a fixture adapted to receive an electric current, said heating element extending circuitously back and forth between separating members in substantially the same plane, then to a slot in the rear of one of the separating members, and finally back to the fixture.

In testimony whereof I aflix m signature.

CHARLES C. ARM TRO'NG. 

